Maintenance of manually, hydraulically, and electrically operated regulating valves, slide gates, various sizes and types of pumps, stationary and mobile overhead hoists and cranes, compressors and pneumatic systems, hydraulic power units, domestic water systems, and plant mechanical equipment. All employees are subject to recall around the clock for emergency response operations, which may require irregular work hours, work at locations other than the normal work location, and may include duties other than those specified in the employees official job description.